Next Sunday, Aggies legend and Panini Authentic-exclusive athlete Johnny Manziel will return to Aggieland for his first public autograph signing since being drafted by the Cleveland Browns. The 2012 Heisman Trophy winner and former Texas A&M All-American will appear on behalf of Panini Authentic at Aggieland Outfitters (303 University Drive East Location) next Sunday, July 12, at 6 p.m. "We have been…